Day 1 Practice Set [SLC / SEE Computer Science]

1.   Define data communication. Give any two examples of it.

Ans: A data communication system is the collection of hardware, software and other devices that allows to exchange data, information and voice between two or more devices through a wire or radio waves. The components of data communication are data, sender, medium, receiver and protocol.

Any two examples of data communication are e-mail and chat.

2.   What is internet?

Ans: Internet is an interconnection of several thousands of computers of different types belonging to the various networks all over the world.

3.   What is computer security?

Ans: The security given to the computer for the protection of hardware, software and data from being lost or damaged due to accidental or intentional harm is known as computer security.

4.   What is computer virus?

Ans: Computer virus is a type of computer program which is written by the programmer with the intent of destroying or damaging the data and programs residing in the computer system.

5.   What is multimedia? Name the five types of media used in multimedia technology.
Ans: Multimedia is the integration of multiple forms of media, which presents information in more interesting and understandable way.

The five types of media used in multimedia technology are:
i) Text                    ii) Audio         iii) Video               

iv) Graphics           v) Animation

6.   What is cyber law?

Ans: The law which governs the legal issues in the cyber space regarding the internet or WWW for digital data processing and transaction is called cyber law.

7.   What is database? Give two examples.

Ans: Database is a collection of related and organized information that can be used for different purpose.
The two examples of database are:
i) Dictionary
ii) Telephone Directory

8.   What is Primary key? Why is it needed?

Ans: Primary key is a field that uniquely identifies the record. It is needed because it neither accepts duplicate values nor permit null values.

9.   Define table. Write different ways to create a table.

Ans: Table is an object of Ms-Access that stores large volume of data in the form of rows and columns.
The different ways to create table are:
i) Design view
ii) Using wizard

iii) Entering data

10.                   What is a modular programming?

Ans: Modular programming is a technique which divides the program into many small, manageable, logical and functional modules or blocks.

11.                   Write down the functions of:

a) OPEN statement:
It opens a sequential file for one of the three possible operations (reading, writing, appending).
b) WRITE# statement:
It sends one or store one or more data items to the specified file using either output or append mode.

12.                   Define C-language.

Ans: C-language is a structured programming language that divides program into many functions.

“To teach is to learn twice.”
Joseph Joubert